Purpose A capture superconducting solenoid is designed for the Experimental Muon Source(EMuS)which is proposed at China Spallation Neutron Source(CSNS)in Dongguan for muon science and neutrino physics research.The cap...Purpose A capture superconducting solenoid is designed for the Experimental Muon Source(EMuS)which is proposed at China Spallation Neutron Source(CSNS)in Dongguan for muon science and neutrino physics research.The capture superconducting solenoid of the EMuS consists of four coils with different radius generating a peak central field of 5 T at 3944 A of nominal current.Methods The aluminum-stabilized NbTi Rutherford cable is used to wind the solenoid coils.Iron yokes are arranged for flux returning and field shielding.Ti alloy Ti-6Al-4V rods are adopted to support the cold mass.The vacuum vessel of the solenoid is manufactured by 304 stainless steel.The coils are pre-stressed by interference fits assembly,the outer support cylinder or binding the coils with aluminum alloy wire in order to reduce the peak stress of the coils.The parameters of the coils such as the thickness and the tensile stress of the binding wire and the thickness of the outer support cylinder have been optimized in order to minimize the cold mass by using FEA software.Results The maximum stress in the winding is allowable with two layers of 40 mm thickness outer support cylinder through interference fits assembly.But the maximum stress in the winding is allowable with 40 mm thickness of binding wire and 30 mm thickness of outer support cylinder.Conclusion The method of binding the windings with aluminum alloy wire is suggested to be used to manufacture the solenoid.This paper presents the mechanical design and analysis of the capture superconducting solenoid for EMuS.展开更多
A compact High Temperature Superconductor(HTS)cable that can carry large current is crucial for developing high field superconducting accelerator magnets.Herein,we are reporting a high current and low AC loss REBCO ca...A compact High Temperature Superconductor(HTS)cable that can carry large current is crucial for developing high field superconducting accelerator magnets.Herein,we are reporting a high current and low AC loss REBCO cable that adopts the Roebel structure,but it is implemented by in‐plane bending stacked REBCO tapes directly to realize the transposition,instead of by punching REBCO tapes to the desired shape.The cable maximizes the utilization of the original REBCO tapes,so that the material cost is significantly reduced comparing with the present“Roebel”REBCO cable.Recently,a prototype cable has been successfully fabricated.The critical current of each REBCO tape after cabling shows no degradation,and the cable’s measured critical current is 1939.8 A at 77 K and self‐field,which is very close to the predicted critical current by simulation.Calculations also show that the AC loss of the cable is lower compared with that of a simple REBCO stack with the same cross‐section and current‐carrying capacity.In this paper,we first introduce the fabrication process of the cable.What follows is the measurement of the in‐plane bending performance of REBCO tapes.Then,we present the design and fabrication of the prototype cable together with current‐carrying performance tests.Finally,the AC loss calculation and analysis of the cable are reported.展开更多
基金National Natural Science Foundation of China(Project:11527811).
文摘Purpose A capture superconducting solenoid is designed for the Experimental Muon Source(EMuS)which is proposed at China Spallation Neutron Source(CSNS)in Dongguan for muon science and neutrino physics research.The capture superconducting solenoid of the EMuS consists of four coils with different radius generating a peak central field of 5 T at 3944 A of nominal current.Methods The aluminum-stabilized NbTi Rutherford cable is used to wind the solenoid coils.Iron yokes are arranged for flux returning and field shielding.Ti alloy Ti-6Al-4V rods are adopted to support the cold mass.The vacuum vessel of the solenoid is manufactured by 304 stainless steel.The coils are pre-stressed by interference fits assembly,the outer support cylinder or binding the coils with aluminum alloy wire in order to reduce the peak stress of the coils.The parameters of the coils such as the thickness and the tensile stress of the binding wire and the thickness of the outer support cylinder have been optimized in order to minimize the cold mass by using FEA software.Results The maximum stress in the winding is allowable with two layers of 40 mm thickness outer support cylinder through interference fits assembly.But the maximum stress in the winding is allowable with 40 mm thickness of binding wire and 30 mm thickness of outer support cylinder.Conclusion The method of binding the windings with aluminum alloy wire is suggested to be used to manufacture the solenoid.This paper presents the mechanical design and analysis of the capture superconducting solenoid for EMuS.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB25000000)the National Key R&D Program of China(Grant No.2018YFA0704200)the Jialin Xie fund(Grant No.E2546KU2)。
文摘A compact High Temperature Superconductor(HTS)cable that can carry large current is crucial for developing high field superconducting accelerator magnets.Herein,we are reporting a high current and low AC loss REBCO cable that adopts the Roebel structure,but it is implemented by in‐plane bending stacked REBCO tapes directly to realize the transposition,instead of by punching REBCO tapes to the desired shape.The cable maximizes the utilization of the original REBCO tapes,so that the material cost is significantly reduced comparing with the present“Roebel”REBCO cable.Recently,a prototype cable has been successfully fabricated.The critical current of each REBCO tape after cabling shows no degradation,and the cable’s measured critical current is 1939.8 A at 77 K and self‐field,which is very close to the predicted critical current by simulation.Calculations also show that the AC loss of the cable is lower compared with that of a simple REBCO stack with the same cross‐section and current‐carrying capacity.In this paper,we first introduce the fabrication process of the cable.What follows is the measurement of the in‐plane bending performance of REBCO tapes.Then,we present the design and fabrication of the prototype cable together with current‐carrying performance tests.Finally,the AC loss calculation and analysis of the cable are reported.
